Circle starts winding down CCTP V1 ahead of the December 1 USDC bridge pause

Burn limits drop from October 31 till a December 1 pause

CCTP hyperlinks $USDC throughout blockchains. On one chain, it burns the stablecoin and mints that a lot on one other chain. To clear the mint, Circle must log out on it, which is named an attestation.

There’s a burn restrict that tells the method how a lot $USDC it could possibly soak up at any given time. In a weblog put up on August 27, Circle mentioned that these limits would begin to be lowered on October 31. Efficiency would worsen over the course of 1 month to be able to eliminate all legacy use.

The V1 contracts will cease on December 1. Integrations nonetheless linked to them then can’t transfer $USDC between chains.

Circle first warned in regards to the transfer away from V1 on November 14, 2025.

Since Noble gained’t get CCTP V2, it’s on a unique schedule. New $USDC minting there was set to shut on October 13.

The Noble $USDC contract and all its CCTP routes will cease engaged on January 12, 2027. Guide redemptions open a day later.

Circle now lists Sui on V2, and all V1 chains besides Noble already use V2.

CCTP V2 provides three parameters to depositForBurn

Plain CCTP, which was known as CCTP V2, has its personal contracts and APIs and may’t work with V1.

TokenMessengerV2 and MessageTransmitterV2 are two of the brand new interfaces that builders might want to change the code to level to. There are three further parameters in V2’s depositForBurn operate: a vacation spot caller, a most price, and a minimal finality threshold.

As an alternative of getting message bytes from an onchain transaction and hashing them, integrations ask for them at a V2 messages API with the transaction hash.

It’s not doable in V2 to make use of replaceDepositForBurn or another outdated capabilities. Builders not have to fret about contract addresses and attestation polling once they use Circle’s Arc App Kits.

V2 provides Normal and Quick Switch modes and helps 31 blockchains. When $USDC comes, programmable hooks let an app begin an computerized motion on the vacation spot chain.

How a lot Quick Switch prices is predicated on the supply chain. There was no price for transfers on V1.

Circle says that there can be extra minter allowances than pending attestations in order that in-flight transfers could be settled earlier than the pause on December 1.

CCTP has come below authorized hearth earlier than. A Drift Protocol investor filed go well with towards Circle in a Massachusetts district courtroom in April in reference to the $280 million Drift exploit, Cryptopolitan reported.

The category motion claims that Circle didn’t freeze round $230 million of $USDC that North Korean hackers channeled by means of CCTP. CEO Jeremy Allaire mentioned Circle freezes wallets on the course of regulation enforcement or courts and shouldn’t be a digital vigilante.

Circle launched its Arc layer-1 blockchain on mainnet in September with validators together with BlackRock, Visa, Mastercard and DTCC.